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(#) Unprotected SMS `BroadcastReceiver`

!!! WARNING: Unprotected SMS `BroadcastReceiver`
   This is a warning.

Id
:   `UnprotectedSMSBroadcastReceiver`
Summary
:   Unprotected SMS `BroadcastReceiver`
Severity
:   Warning
Category
:   Security
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   1.5.0 (November 2015)
Affects
:   Manifest files
Editing
:   This check runs on the fly in the IDE editor
See
:   https://goo.gle/UnprotectedSMSBroadcastReceiver
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/UnsafeBroadcastReceiverDetector.java)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/UnsafeBroadcastReceiverDetectorTest.java)

BroadcastReceivers that declare an intent-filter for `SMS_DELIVER` or
`SMS_RECEIVED` must ensure that the caller has the `BROADCAST_SMS`
permission, otherwise it is possible for malicious actors to spoof
intents.

!!! Tip
   This lint check has an associated quickfix available in the IDE.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
AndroidManifest.xml:12:Warning: BroadcastReceivers that declare an
intent-filter for SMS_DELIVER or SMS_RECEIVED must ensure that the
caller has the BROADCAST_SMS permission, otherwise it is possible for
malicious actors to spoof intents [UnprotectedSMSBroadcastReceiver]
    &lt;receiver
     --------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here is the source file referenced above:

`AndroidManifest.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="test.pkg"
    android:versionCode="1"
    android:versionName="1.0" &gt;

    &lt;uses-sdk android:minSdkVersion="14" /&gt;

    &lt;application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" &gt;
        &lt;receiver
            android:label="@string/app_name"
            android:name=".TestReceiver" &gt;
                &lt;intent-filter&gt;
                    &lt;action android:name="android.provider.Telephony.SMS_RECEIVED"/&gt;
                &lt;/intent-filter&gt;
        &lt;/receiver&gt;
    &lt;/application&gt;

&lt;/manifest&gt;

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/UnsafeBroadcastReceiverDetectorTest.java)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `UnsafeBroadcastReceiverDetector.testBroken2`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Adding the suppression attribute
  `tools:ignore="UnprotectedSMSBroadcastReceiver"` on the problematic
  XML element (or one of its enclosing elements). You may also need to
  add the following namespace declaration on the root element in the
  XML file if it's not already there:
  `xmlns:tools="http://schemas.android.com/tools"`.

  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;manifest xmlns:tools="http://schemas.android.com/tools"&gt;
      ...
      &lt;receiver tools:ignore="UnprotectedSMSBroadcastReceiver" .../&gt;
    ...
  &lt;/manifest&gt;
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="UnprotectedSMSBroadcastReceiver" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'UnprotectedSMSBroadcastReceiver'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore UnprotectedSMSBroadcastReceiver ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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